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| Wiring Diagram | Rating: 
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| Posted: 05-15-2006 09:54 pm |
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1st Post |
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Jim DeClerck Member 
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On the top of the JH wiring diagram there is a key explaining the colour and cable size codes. (Picture attached) The 4 cable sizes shown in the cable code columns are: C 14.010, SC 14.010, SD 28.012 and SP 44.012. How does one translate the numerical portions of the codes, keeping in mind that there are two coded 14.010. What is the significance of the numbers to the left and to the right of the decimal points? How are the C and SC cables different? Attachment: 100_0861a.jpg (Downloaded 142 times)
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| Posted: 05-16-2006 02:16 am |
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2nd Post |
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Mark Rosenbaum Member 
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They're using the British stranded wire standard. It's a fairly elegant system that replaced the horde of antiquated wire gauge schemes that crept into use during the past few centuries. The numbering system involves (a) the number of strands in a wire, and (b) the diameter in millimeters of each strand. In this system, a 14-0.10 wire would have 14 strands each 0.10mm in diameter, and a 44-0.12 wire would have 44 strands each 0.12mm diameter. Often whoever writes down the strand size is far too important and busy a fellow to bother with decimal points, so you instead see 14-010 or 44-012, or even 14-10 or 44-12. (With the collapse of the UK auto industry, I suspect that many of these folks have gone to work for the Inland Revenue. 8={ ) See http://www.britishwiring.com/CAT02_07.PDF for more information on the current carrying capacity and equivalence to US wire gauges.
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| Posted: 05-16-2006 05:17 am |
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3rd Post |
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Jim DeClerck Member
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Outstanding information, as usual, Mark. Thanks for filling in the blanks for me.
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| Posted: 12-24-2024 11:12 pm |
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4th Post |
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madmicmad Member
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Hi Jim, Did you ever find out how the C14.010 and the SC14.010 are different? Mike.
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| Posted: 12-25-2024 01:55 pm |
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5th Post |
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noomg Member
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Mike, That post is 18 years old Jim may not even have a Jensen-Healey now.
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| Posted: 12-25-2024 03:00 pm |
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6th Post |
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madmicmad Member
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I hadn’t noticed the date. I imagine you’re right. I’ll keep looking. Someone’s bound to know. Thanks for posting. Happy holidays!
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| Posted: 12-25-2024 03:31 pm |
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7th Post |
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DonBurns Member
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Could it be stranded 14 G vs. solid 14 G ?
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| Posted: 12-25-2024 06:10 pm |
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8th Post |
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vnavaret Member 
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DonBurns wrote: Could it be stranded 14 G vs. solid 14 G ? If that were the case, the number of strands would be 1, not 14. Remember that the first number (14 in this case) refers to the number of strands in the wire. My guess would be that S vs SC has something to do with the wire insulation. Cloth vs PVC, insulation thickness, or ??? Vance
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| Posted: 12-26-2024 02:53 am |
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9th Post |
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madmicmad Member
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Came across an interesting bit of Lucas trivia while reading the FAQ's on the autosparks.co.uk site titled "9 or 14 strand cables?". The two 14 strand codes C and SC listed on the schematic might correspond to C 14-010 and SC 14-012, implying a typo. Also, contrary to Jim DeClerck's post above, I believe the second number listed is the conductor diameter, but it's imperial units not millimeters, which jives with .25mm and .30mm listed on the autosparks site. Autosparks FAQ: "We have been questioned in the past as to why we use 9 strand cable when it was never used originally. This was because in the old days Lucas manufactured two sizes of 14 strand cable. 14/0.10 (14/0.25mm) and 14/0.12 cable. (14/0.30mm). As all of the larger sizes of cables had a strand size of 0.12 (0.30mm), Lucas rationalised their manufacturing and replaced the odd 14/0.10 cable with 9/0.12 (9/0.30mm) giving an equal carrying capacity." BTW... I think the autosparks site has a decimal error... s/b 14/.010 and 14/.012. Last edited on 12-26-2024 02:57 am by madmicmad |
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| Posted: 12-26-2024 02:17 pm |
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10th Post |
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noomg Member
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Good morning guys, this is interesting stuff and nice to know but aren't we getting a bit into the weeds here. I could see the concern if you were doing a concours restoration of one of the 600+ Austin-Healey factory 100Ms and it could mean the difference between the car selling for plus or minus $100,000. Whereas the difference for a Jensen-Healey is probably going to be a few thousand dollars at best. As far as I can tell nobody is looking for a concours Jenesen-Healey.
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| Posted: 12-26-2024 02:29 pm |
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11th Post |
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madmicmad Member
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Yep. That's me, in the weeds. I read a quote once, how we do anything is how we do everything. I'm fascinated by the details, the history, and solving a mystery, to a fault. If I need to dial it in, let me know. Thanks for the replies. Much appreciated.
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